Advantech MIC-6314 Series, User Manual

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67 MIC-6314 User Manual
Chapter 3
B
MC Firmware
O
peration
3.6 UART and UART Multiplexer
3.6.1 UART Block Diagram
Figure 3.2 UART functional block overview
3.7 ACPI
3.7.1 ACPI-Featured Graceful Shutdown
If a shutdown request is sent (via a hot-swap front panel handle “open” event or an
IPMI command), the BMC will initiate OS shutdown via the ACPI power button signal
routed to the x86 system. The ACPI daemon running on the payload OS starts to
shut down the system once it detects the ACPI event. When OS shutdown is com-
plete, the payload will indicate the achieved sleep state to the BMC.
3.7.2 Graceful Shutdown Timeout
A graceful shutdown timeout is implemented for payload operating systems without
ACPI support or in the event that the shutdown process is not completed (no active
x86 sleep state).
If the BMC does not receive a sleep state activated signal within before the timeout
period of 60 seconds, it will still power off the payload.
Note! The payload OS used with MIC-6314 must support ACPI to enable the
module graceful shutdown feature.